Power battery and vehicle

Abstract

The invention provides a power battery and a vehicle, the power battery comprises a battery cell, a liquid cooling device and a heating device, the liquid cooling device comprises a first liquid cooling chamber, a second liquid cooling chamber and a plurality of liquid cooling flow channels, the first liquid cooling chamber and the second liquid cooling chamber are oppositely arranged, one end of each liquid cooling flow channel is communicated with the first liquid cooling chamber, and the other end of each liquid cooling flow channel is communicated with the second liquid cooling chamber; a mounting space for mounting a battery cell is formed between every two adjacent liquid cooling flow channels at intervals, and the liquid cooling flow channels are arranged on the side surfaces of the battery cell. The heating device is arranged at the bottom of the battery cell. According to the power battery provided by the invention, the mounting space can be formed between the two adjacent liquid cooling runners in the liquid cooling device at intervals, so that at least part of the battery cell can extend into the mounting space, the heating device and the liquid cooling device can be positioned in different directions of the battery cell, and only the heating device is arranged at the bottom of the battery cell; and the liquid cooling flow channel is positioned on the side surface of the battery cell, so that the space of the power battery in the height direction can be saved, the temperature of the battery cell can be adjusted to a balanced state through a corresponding liquid cooling device or a heating device in various different temperature environments, the performance of the power battery is favorably improved, and the service life of the battery cell is prolonged.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a power battery and a vehicle. Background Art

[0002] The storage capacity and performance of power batteries in new energy vehicles are greatly affected by temperature. Too high or too low temperature will affect the storage capacity of the power battery, and thus affect the endurance of the new energy vehicle.

[0003] In the prior art, when the power battery cell is overheated, a liquid cooling plate is generally provided at the bottom of the cell to absorb the heat generated by the cell and dissipate the heat. However, due to the limited space inside the power battery, it is difficult to simultaneously provide a liquid cooling plate and a heating device at the bottom of the cell, which also makes it difficult to achieve heating of the cell by providing a heating device in a low temperature environment. Summary of the invention

[0004] The purpose of the present application is to provide a power battery and a vehicle to achieve heat dissipation or heating of the battery cells in a high temperature environment or a low temperature environment.

[0005] In a first aspect, the present application provides a power battery, comprising:

[0006] Battery cells;

[0007] A liquid cooling device, the liquid cooling device comprising a first liquid cooling chamber, a second liquid cooling chamber and a plurality of liquid cooling channels arranged opposite to each other, one end of the liquid cooling channel being in communication with the first liquid cooling chamber, the other end of the liquid cooling channel being in communication with the second liquid cooling chamber, an installation space for installing the battery cell being formed between two adjacent liquid cooling channels, and the liquid cooling channel being arranged on a side of the battery cell;

[0008] The heating device is arranged at the bottom of the battery cell.

[0009] In one possible design, the heating device includes a middle area and an edge area, and the heating device includes a plurality of resistors, wherein the plurality of resistors are distributed in the middle area and the edge area, and the heating power of the resistors in the middle area is lower than the heating power of the resistors in the edge area.

[0010] In a possible design, the heating device further includes a heating plate and a heating component, and the heating component is mounted on the heating plate;

[0011] The heating components each include a heating film and a plurality of resistors, wherein the plurality of resistors are encapsulated in the heating film.

[0012] In a possible design, a positioning groove is provided on the heating plate, and the heating component is installed in the positioning groove; the thickness of the heating component is less than or equal to the depth of the positioning groove.

[0013] In one possible design, the positioning groove is a strip groove; the positioning groove includes a first groove and a second groove, the first groove is located in the middle area, and the second groove is located in the edge area; and / or, the positioning groove includes a third groove, at least part of the third groove is located in the middle area, and at least another part of the third groove is located in the edge area.

[0014] In a possible design, a plurality of first grooves are provided, and at least some of the first grooves have different lengths; along a direction perpendicular to the extension direction of the first grooves, the positions of the heating components in at least two of the first grooves are aligned; and / or,

[0015] A plurality of the second grooves are provided, and at least some of the second grooves have different lengths; along a direction perpendicular to the extending direction of the second grooves, the positions of the heating components in at least two of the second grooves are aligned.

[0016] In a possible design, the liquid cooling device includes a first heat insulating member and a second heat insulating member arranged opposite to each other, and the first heat insulating member, the second heat insulating member, the first liquid cooling chamber, and the second liquid cooling chamber are surrounded by a frame structure;

[0017] The liquid cooling device further comprises a first positioning plate and a second positioning plate, wherein the first positioning plate and the second positioning plate are respectively arranged on both sides of the frame structure in the height direction, one end of the battery cell abuts against the first positioning plate, and the other end of the battery cell abuts against the second positioning plate;

[0018] The heating device is arranged on a side of the second positioning plate away from the battery core.

[0019] In a possible design, a first limiting groove is provided on the first positioning plate, and a second limiting groove is provided on the second positioning plate. One end of the battery cell is clamped in the first limiting groove, and the other end of the battery cell is clamped in the second limiting groove.

[0020] In a possible design, the power battery further includes an upper cover and a bottom plate, the upper cover is buckled onto the bottom plate, and a receiving space for receiving the liquid cooling device, the battery cell and the heating device is formed between the upper cover and the bottom plate.

[0021] In a possible design, the power battery further includes an insulating plate, and the insulating plate is disposed between the upper cover and the first positioning plate.

[0022] In a possible design, the liquid-cooling channel is provided with a plurality of first limiting parts, and another adjacent liquid-cooling channel is provided with a plurality of second limiting parts, the first limiting parts and the second limiting parts are positioned relative to each other, and the installation space is formed between the first limiting parts and the second limiting parts, and the side surfaces of the battery cell are respectively fitted with the first limiting parts and the second limiting parts.

[0023] In a second aspect, the present application also provides a vehicle, which includes the power battery provided in the first aspect of the present application.

[0024] The technical solution provided by this application can achieve the following beneficial effects:

[0025] In the power battery and vehicle provided by the present application, an installation space can be formed between two adjacent liquid cooling channels in the liquid cooling device, so that at least part of the battery cell can be extended into the installation space, and the heating device and the liquid cooling device can be located in different directions of the battery cell. Only the heating device is arranged at the bottom of the battery cell, and the liquid cooling channel is located on the side of the battery cell, thereby saving space in the height direction of the power battery. At the same time, the liquid cooling device can be started in a high-temperature environment to dissipate heat and cool the battery cell, and the heating device can be started in a low-temperature environment to heat and heat the battery cell, thereby satisfying that the battery cell temperature can be adjusted to a balanced state by the corresponding liquid cooling device or heating device in various temperature environments, which is beneficial to improving the performance of the power battery and extending the service life of the battery cell.

[0026] It should be understood that the foregoing general description and the following detailed description are exemplary only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 An exploded diagram of a power battery provided in an embodiment of the present application;

[0028] Figure 2 A schematic diagram of the structure of a liquid cooling device in a power battery provided in an embodiment of the present application;

[0029] Figure 3 A partial schematic diagram of a power battery provided in an embodiment of the present application;

[0030] Figure 4 A top view of the heating device provided in an embodiment of the present application installed in a power battery;

[0031] Figure 5 A schematic diagram of the structure of a heating device in a power battery provided in an embodiment of the present application;

[0032] Figure 6 A partial cross-sectional view of a heating assembly provided in one embodiment of the present application;

[0033] Figure 7A partial cross-sectional view of a heating assembly provided in another embodiment of the present application;

[0034] Figure 8 A schematic diagram of the structure of a heating plate in a heating device provided in an embodiment of the present application;

[0035] Fig. 9 A top view of a heating plate provided in one embodiment of the present application;

[0036] Fig.10 A top view of a heating plate provided in another embodiment of the present application.

[0037] Reference numerals:

[0038] 1- housing;

[0039] 11- upper cover;

[0040] 12- bottom plate;

[0041] 2- Heating device;

[0042] 21- heating plate;

[0043] 211- positioning groove;

[0044] 211a-first groove;

[0045] 211b - second slot;

[0046] 211c - third slot;

[0047] 22- heating component;

[0048] 221- heating film;

[0049] 222-resistance;

[0050] 2a - middle area;

[0051] 2b - marginal area;

[0052] 3-Battery cell;

[0053] 4-Liquid cooling device;

[0054] 41-first liquid cooling chamber;

[0055] 411-liquid inlet pipe;

[0056] 42- second liquid cooling chamber;

[0057] 421-liquid outlet pipe;

[0058] 43- first thermal insulation member;

[0059] 44 - second thermal insulation member;

[0060] 45-Installation space;

[0061] 46-liquid cooling channel;

[0062] 461-first limiting portion;

[0063] 462-second limiting portion;

[0064] 5-first positioning plate;

[0065] 51-First limit slot

[0066] 6- second positioning plate;

[0067] 61- second limiting groove;

[0068] X-length direction;

[0069] Y-width direction;

[0070] Z-height direction.

[0071] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0073] In the description of this application, unless otherwise clearly specified and limited, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance; unless otherwise specified or explained, the term "plurality" refers to two or more; the terms "connected" and "fixed" should be understood in a broad sense, for example, "connected" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0074] In the description of this specification, it should be understood that the directional words such as "upper" and "lower" described in the embodiments of the present application are described at the angles shown in the accompanying drawings and should not be understood as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to another element "upper" or "lower", but also indirectly connected to another element "upper" or "lower" through an intermediate element.

[0075] Figure 1 An exploded diagram of a power battery provided in an embodiment of the present application, such as Figure 1 As shown, the present application provides a power battery, which can be used in vehicles, such as new energy vehicles. The power battery includes a housing 1, a liquid cooling device 4, a heating device 2, and a battery cell 3. The housing 1 has a storage space, which can be used to accommodate the battery cell 3, the heating device 2, and the liquid cooling device 4. The housing 1 can provide protection for the battery cell 3, the heating device 2, and the liquid cooling device 4 inside the housing 1.

[0076] The battery cell 3 is the core part of the power battery and plays a vital role in new energy vehicles. It is a key component for storing and releasing electric energy, and directly determines the endurance, safety and overall performance of new energy vehicles. The battery cell 3 stores and releases electric energy through chemical reactions. There can be multiple battery cells 3, and multiple battery cells 3 can be arranged in an array.

[0077] The heating device 2 is arranged at the bottom of the battery core 3 to support and heat the battery core 3 .

[0078] Figure 2 This is a schematic diagram of the structure of the liquid cooling device 4 in the power battery provided in the embodiment of the present application, as shown in FIG. Figure 2 As shown, the liquid cooling device 4 includes a plurality of liquid cooling channels 46 and a first liquid cooling chamber 41 and a second liquid cooling chamber 42 that are arranged opposite to each other. The first liquid cooling chamber 41 is provided with a liquid inlet pipe 411 , and the second liquid cooling chamber 42 is provided with a liquid outlet pipe 421 .

[0079] Figure 3 A partial schematic diagram of a power battery provided in an embodiment of the present application, such as Figure 3 As shown, one end of the liquid cooling channel 46 is connected to the first liquid cooling chamber 41, and the other end of the liquid cooling channel 46 is connected to the second liquid cooling chamber 42. An installation space 45 for installing the battery cell 3 can be formed between two adjacent liquid cooling channels 46, and the liquid cooling channel 46 is arranged on the side of the battery cell 3.

[0080] Among them, an installation space 45 is formed between two adjacent liquid cooling channels 46, so that at least part of the battery cell 3 can be extended into the installation space 45, so that the heating device 2 and the liquid cooling device 4 can be located in different directions of the battery cell 3. Only the heating device 2 is arranged at the bottom of the battery cell 3, and the liquid cooling channel 46 is located on the side of the battery cell 3, thereby saving space in the height direction Z of the power battery. At the same time, the liquid cooling device 4 can be started in a high temperature environment to dissipate heat and cool the battery cell 3, and the heating device 2 can be started in a low temperature environment to heat and heat the battery cell 3, so that the battery cell 3 can be satisfied that the temperature of the battery cell 3 can be adjusted to a balanced state by the corresponding liquid cooling device 4 or the heating device 2 in various temperature environments, which is beneficial to improving the performance of the power battery and extending the service life of the battery cell 3.

[0081] Among them, the liquid cooling channel 46, the first liquid cooling chamber 41 and the second liquid cooling chamber 42 are all hollow structures, and the liquid cooling channel 46, the first liquid cooling chamber 41 and the second liquid cooling chamber 42 all have spaces for the flow of cooling liquid. Since the first liquid cooling chamber 41 and the second liquid cooling chamber 42 are respectively arranged on opposite sides of the liquid cooling channel 46, the cooling liquid can enter the first liquid cooling chamber 41 from the liquid inlet pipe 411, and then enter the second liquid cooling chamber 42 after passing through each liquid cooling channel 46, and further discharge the cooling liquid through the liquid outlet pipe 421, so that the cooling liquid can be circulated in the liquid cooling device 4, and the heat dissipation and cooling of the battery cell 3 can be achieved.

[0082] Among them, a power device such as a hydraulic pump can be used to provide driving force for the coolant to realize the circulation of the coolant in the liquid cooling device 4. The power device such as the hydraulic pump can be accurately controlled by the controller of the whole vehicle.

[0083] It is understandable that during the operation or charging of the car, the battery cell 3 of the power battery will emit heat. Since the power battery has multiple battery cells 3 arranged in an array, the heat dissipation effect of the battery cell 3 in the middle area 2a will be weaker than the heat dissipation effect of the battery cell 3 in the edge area 2b, resulting in heat easily accumulating at the battery cell 3 in the middle area 2a, thereby causing the temperature of the battery cell 3 in the middle area 2a to be higher than the temperature of the battery cell 3 in the edge area 2b. When the car is running or charging in a low temperature environment, the low temperature environment will cause the power battery to store less electricity, affecting the endurance of the car. Therefore, the power battery needs to be heated in a low temperature environment. However, if a soaking plate is used to heat the battery cell 3, the soaking plate will provide uniform and constant heat at each position, that is, the heating effect of each battery cell 3 is uniform and consistent, which leads to the problem that after the battery cell 3 is heated, the temperature of the battery cell 3 in the middle area 2a is still relatively high, and the temperature of the battery cell 3 in the edge area 2b is relatively low, which is not conducive to the balanced control of the power battery temperature.

[0084] In view of this, Figure 4A top view of the heating device 2 provided in the embodiment of the present application installed in the power battery, as shown in FIG. Figure 4 As shown, in this embodiment, the heating device 2 includes a middle area 2a and an edge area 2b, and the heating device 2 includes a plurality of resistors 222, and the plurality of resistors 222 are distributed in the middle area 2a and the edge area 2b, and the heating power of the resistors 222 located in the middle area 2a is lower than the heating power of the resistors 222 located in the edge area 2b.

[0085] The edge region 2b is a partial region close to the edge of the heating device 2, and the middle region 2a is a region away from the edge of the heating device 2. For example, the edge region 2b may surround the middle region 2a. During the operation or charging of the vehicle, the heat of the battery cells 3 in the middle region 2a will be higher than the heat of the battery cells 3 in the edge region 2b.

[0086] In this embodiment, at least some of the resistors 222 have different heating powers, wherein different heating powers can be achieved by providing resistors 222 of different volumes.

[0087] Among them, the heating power of the resistor 222 with a larger volume is greater than the heating power of the resistor 222 with a smaller volume. Exemplarily, the resistor 222 includes a first resistor and a second resistor, the volume of the first resistor is greater than the volume of the second resistor, so that the heating power of the first resistor is greater than the heating power of the second resistor, the first resistor is arranged in the edge area 2b, and the second resistor is arranged in the middle area 2a. In this embodiment, by making the heating power of the resistor 222 in the middle area 2a lower than the heating power of the resistor 222 located in the edge area 2b, the heat generated by the resistor 222 in the middle area 2a can be lower than the heat generated by the resistor 222 in the edge area 2b, that is, the heating temperature of the battery cell 3 with a relatively high temperature in the middle area 2a is lower than the heating temperature of the battery cell 3 with a relatively low temperature in the edge area 2b, so that the temperature of the battery cell 3 in the middle area 2a after heating can be consistent or nearly consistent with the temperature of the battery cell 3 in the edge area 2b after heating, so that the temperature balance of the power battery after heating can be achieved in a low temperature environment.

[0088] In one embodiment, along the height direction Z of the power battery, the ratio of the projected area of ​​the middle region 2a to the projected area of ​​the heating device 2 is between 1 / 2 and 2 / 3. When multiple battery cells 3 are arranged in an array, the heat of the battery cells 3 located in the middle region 2a is dissipated more slowly, and the heat accumulation coverage of the middle region 2a is larger than that of the edge region 2b. Therefore, the resistor 222 with a smaller heating power can be arranged in the middle region 2a with a larger projected area, and the resistor 222 with a larger heating power can be arranged in the edge region 2b with a smaller projected area, so that after the battery cells 3 are heated by the heating device 2, the temperature of each battery cell 3 can be kept or nearly consistent, and the temperature at each position of the power battery can be balanced.

[0089] In one embodiment, Figure 5 This is a schematic diagram of the structure of the heating device 2 in the power battery provided in the embodiment of the present application, as shown in Figure 5 As shown, the heating device 2 further includes a heating plate 21 and a heating assembly 22 , and the heating assembly 22 is installed on the heating plate 21 .

[0090] Figure 6 A partial cross-sectional view of a heating assembly 22 provided in one embodiment of the present application, as shown in FIG. Figure 6 As shown, the heating assembly 22 includes a heating film 221 and a plurality of resistors 222, and the plurality of resistors 222 are encapsulated in the heating film 221. The heating film 221 can constrain and position the resistors 222, and can realize the installation of the plurality of resistors 222 wrapped in the heating film 221 onto the heating plate 21 as a whole, which is convenient for operation, can also ensure the installation accuracy of the resistors 222 on the heating plate 21, and can provide protection for the resistors 222. In some other embodiments, Figure 7 A partial cross-sectional view of a heating assembly 22 provided in another embodiment of the present application is shown in FIG. Figure 7 As shown, the resistor 222 can also be fixed on the surface of the heating film 221 .

[0091] In one embodiment, the heating assembly 22 may be provided with one, wherein the heating film 221 and the heating plate 21 may have the same or similar size, and the heating film 221 may cover both the middle area 2a and the edge area 2b. In one embodiment, the heating assembly 22 may be provided with multiple, wherein the size of the heating assembly 22 may be much smaller than the size of the heating plate 21, and the multiple heating assemblies 22 may be respectively provided in the middle area 2a and the edge area 2b according to the heating requirements of the battery cell 3.

[0092] In one embodiment, for example, a plurality of heating components 22 are provided. The plurality of resistors 222 in the heating film 221 may all be the same resistors 222, so that it is easy to determine the installation position of the heating component 22 on the heating disk 21. For example, when the resistors 222 packaged in a heating film 221 are all resistors 222 with larger heating power, the heating component 22 may be disposed as a whole in the edge region 2b of the heating disk 21; when the resistors 222 packaged in a heating film 221 are all resistors 222 with smaller heating power, the heating component 22 may be disposed as a whole in the middle region 2a of the heating disk 21.

[0093] In one embodiment, a plurality of heating components 22 are provided as an example. The multiple resistors 222 in the heating film 221 may also be resistors 222 with different heating powers, that is, the heating film may include resistors 222 with larger heating power, or resistors 222 with smaller heating power. Among them, as described above, the resistors 222 with larger heating power or the resistors 222 with smaller heating power can be achieved by adjusting the volume of the resistors 222, which will not be repeated here. In this embodiment, for a heating component 22, the position of the heating component 22 corresponding to the resistor 222 with larger heating power can be set in the edge area 2b of the heating disk 21, and the position of the heating component 22 corresponding to the resistor 222 with smaller heating power can be set in the middle area 2a of the heating disk 21, thereby, different parts of a heating component 22 can be respectively located in the middle area 2a and the edge area 2b of the heating disk 21, which can be flexibly set according to the different heating requirements of the battery cell 3, and has strong versatility.

[0094] In addition, the distance between each resistor 222 in the heating film 221 can also be flexibly set according to the heating requirement of the battery cell 3, which is not limited in this embodiment.

[0095] The heating plate 21 can be fixed on the housing 1, for example, by welding, so as to ensure the reliability of the fixed connection between the heating plate 21 and the housing 1. The heating plate 21 can achieve reliable support for the heating component 22, and also facilitate the installation of the heating component 22, ensuring the position accuracy of the installation of the heating component 22.

[0096] In one embodiment, the heating plate 21 may be made of structural steel material. After the heating plate 21 is fixedly connected to the shell 1, it is beneficial to improve the structural strength of the shell 1, achieve side energy absorption, prevent side collision, and improve the safety of the power battery.

[0097] In one embodiment, Figure 8 This is a schematic diagram of the structure of the heating plate 21 in the heating device 2 provided in the embodiment of the present application, as shown in FIG. Figure 8As shown, a plurality of positioning grooves 211 are provided on the heating plate 21, and the heating assembly 22 is installed in the positioning grooves 211. The positioning grooves 211 can limit the position of the heating assembly 22 and ensure the stability of the heating assembly 22 installed on the heating plate 21.

[0098] The thickness of the heating component 22 is less than or equal to the depth of the positioning groove 211. The heating component 22 will not protrude from the surface of the heating plate 21, thereby ensuring the flatness of the surface of the heating plate 21, and facilitating the battery cell 3 to contact and stably support on the heating plate 21. Exemplarily, the thickness of the heating component 22 is equal to the depth of the positioning groove 211, that is, after the heating component 22 is installed in the positioning groove 211, the surface of the heating component 22 that protrudes from the positioning groove 211 is flush with the surface of the heating plate 21, and the battery cell 3 can contact and stably support on the heating plate 21 and the heating component 22 at the same time. At the same time, the heating component 22 can directly conduct the generated heat to the battery cell 3 by contacting the battery cell 3, thereby realizing rapid heating of the battery cell 3.

[0099] In one embodiment, if Figure 8 As shown, the positioning groove 211 may be a strip groove. Exemplarily, when the positioning groove 211 is a strip groove, the strip groove may extend in the length direction X or the width direction Y of the heating plate 21. The strip groove may be a straight groove, such as a rectangular groove; the strip groove may also be an arc groove, such as a wavy groove. There are multiple strip grooves, and the multiple strip grooves may be arranged in parallel and at intervals. Some of the strip grooves may be located in the middle area 2a, and some of the strip grooves may be located in the edge area 2b.

[0100] In some other embodiments, the positioning groove 211 may also be an annular groove, which is not limited in this embodiment.

[0101] In one embodiment, Fig. 9 A top view of a heating plate 21 provided in one embodiment of the present application is shown in FIG. Fig. 9 As shown, the middle area 2a has edge areas 2b on both sides along the width direction Y of the heating disk 21. The positioning groove 211 may include a first groove 211a and a second groove 211b, the first groove 211a is located in the middle area 2a, and the second groove 211b is located in the edge area 2b. The heating powers of the multiple resistors 222 of the heating assembly 22 installed in the first groove 211a can be consistent, and the heating powers of the resistors 222 of the heating assembly 22 installed in the second groove 211b can be consistent, and the heating power of the resistors 222 of the heating assembly 22 installed in the first groove 211a is smaller, and the heating power of the resistors 222 of the heating assembly 22 installed in the second groove 211b is larger.

[0102] like Fig. 9As shown, a plurality of first grooves 211a may be provided, and at least some of the first grooves 211a have different lengths. For example, first grooves 211a with longer lengths and first grooves 211a with shorter lengths may be distributed alternately, thereby avoiding excessive reduction in structural strength due to the grooves on the heating plate 21. In a direction (Y direction) perpendicular to the extension direction (X direction) of the first grooves 211a, the positions of the heating components 22 in at least two first grooves 211a are aligned, thereby ensuring uniform heating.

[0103] In some other embodiments, a plurality of second grooves 211b may be provided, and at least some of the second grooves 211b have different lengths. For example, the second grooves 211b with longer lengths and the second grooves 211b with shorter lengths may be distributed alternately. Along the direction (Y direction) perpendicular to the extension direction (X direction) of the second grooves 211b, the positions of the heating components 22 in at least two second grooves 211b are aligned. The arrangement of the second grooves 211b and the arrangement of the heating components 22 in the second grooves 211b are similar to the arrangement of the first grooves 211a and the arrangement of the heating components 22 in the first grooves 211a, and are not described in detail here.

[0104] In one embodiment, Fig.10 A top view of a heating plate 21 provided in another embodiment of the present application is shown in FIG. Fig.10 As shown, the edge region 2b surrounds the middle region 2a, that is, both sides of the middle region 2a along the length direction X and the width direction Y of the heating plate 21 are the edge regions 2b. The positioning groove 211 may also include a third groove 211c, at least part of the third groove 211c is located in the middle region 2a, and at least another part of the third groove 211c is located in the edge region 2b. The multiple resistors 222 in the heating component 22 installed in the third groove 211c may have different heating powers, and the position of the resistor 222 corresponding to the larger heating power in the heating component 22 may be located in the edge region 2b, and the position of the resistor 222 corresponding to the smaller heating power in the heating component 22 may be located in the middle region 2a.

[0105] The heating plate 21 may be provided with the first groove 211a, the second groove 211b and the third groove 211c at the same time, or only with the first groove 211a and the second groove 211b, or only with the third groove 211c. In some other embodiments, the first groove 211a and the third groove 211c may be provided at the same time, or the second groove 211b and the third groove 211c may be provided at the same time. Thus, the setting of the positioning groove 211 can be more flexible and can meet the heating requirements of different battery cells 3. The above-mentioned different setting methods of the positioning groove 211 all need to cover the middle area 2a and the edge area 2b.

[0106] In one embodiment, if Figure 2 As shown, the liquid cooling device 4 includes a first heat insulating member 43 and a second heat insulating member 44 which are arranged opposite to each other, and the first heat insulating member 43, the second heat insulating member 44, the first liquid cooling chamber 41 and the second liquid cooling chamber 42 are arranged to form a frame structure. Among them, the material of the first liquid cooling chamber 41 and the second liquid cooling chamber 42 can be a metal material with heat conductivity. The first heat insulating member 43 and the second heat insulating member 44 can be a foam material with heat insulation ability. The first heat insulating member 43 and the second heat insulating member 44 can reduce the temperature of the coolant in the liquid cooling channel 46 and conduct it to the space outside the liquid cooling device 4, thereby avoiding the increase of the ambient temperature of the liquid cooling device 4. In addition, a layer of heat insulating material such as foam can also be provided on the outer surface of the first liquid cooling chamber 41 and the second liquid cooling chamber 42 to further prevent the heat from dissipating to the outside, which is conducive to the heat dissipation through the circulating coolant, thereby ensuring that the temperature of the surrounding components of the liquid cooling device 4 is maintained constant and avoiding the temperature increase of the surrounding components.

[0107] like Figure 1 As shown, the liquid cooling device 4 further includes a first positioning plate 5 and a second positioning plate 6, which are respectively arranged on both sides of the frame structure along the height direction Z, one end of the battery cell 3 abuts against the first positioning plate 5, and the other end of the battery cell 3 abuts against the second positioning plate 6, and the heating device 2 is arranged on the side of the second positioning plate 6 away from the battery cell 3. Among them, the first positioning plate 5 and the second positioning plate 6 can realize the positioning of the battery cell 3 and ensure the stability of the battery cell 3 after installation.

[0108] In one embodiment, if Figure 1 As shown, the first positioning plate 5 is provided with a first limiting groove 51, and the second positioning plate 6 is provided with a second limiting groove 61. One end of the battery cell 3 is clamped in the first limiting groove 51, and the other end of the battery cell 3 is clamped in the second limiting groove 61. The shape and size of the first limiting groove 51 and the second limiting groove 61 can be adapted to the cross-sectional shape and size of the battery cell 3. For example, the cross-sectional shape of the battery cell 3 can be circular, and the shape of the first limiting groove 51 and the second limiting groove 61 can also be circular. After the battery cell 3 is matched with the first limiting groove 51 and the second limiting groove 61, the first limiting groove 51 and the second limiting groove 61 can realize the circumferential limitation of the battery cell 3 to prevent the battery cell 3 from shaking.

[0109] In one embodiment, if Figure 1 As shown, the housing 1 may include an upper cover 11 and a bottom plate 12, and the upper cover 11 is buckled on the bottom plate 12. For example, the upper cover 11 may be fixedly buckled on the bottom plate 12 by bolts or other connecting parts. An accommodating space for accommodating the liquid cooling device 4, the battery cell 3 and the heating device 2 may be formed between the upper cover 11 and the bottom plate 12. Through the cooperation of the upper cover 11 and the bottom plate 12, the disassembly, assembly and maintenance of various structural components such as the liquid cooling device 4, the battery cell 3 and the heating device 2 can be facilitated.

[0110] Among them, a bracket can be set on the base plate 12, and the first liquid cooling chamber 41 and the second liquid cooling chamber 42 of the liquid cooling device 4 can be fixed on the bracket by bolts and other connecting parts, so as to facilitate the connection between the liquid cooling device 4 and the shell 1, and at the same time ensure the reliability of the connection between the liquid cooling device 4 and the shell 1.

[0111] In one embodiment, the power battery further includes an insulating plate, which is disposed between the upper cover 11 and the first positioning plate 5. The insulating plate can separate the upper cover 11 from the first positioning plate 5, which is beneficial to avoid the formation of a conductive circuit between the battery cell 3, the first positioning plate 5 and the upper cover 11 due to factors such as a short circuit, thereby causing a potential safety hazard to the power battery.

[0112] In one embodiment, if Figure 3 As shown, the liquid-cooling channel 46 is provided with a plurality of first limiting portions 461, and another adjacent liquid-cooling channel 46 is provided with a plurality of second limiting portions 462, the first limiting portions 461 and the second limiting portions 462 are positioned opposite to each other, and an installation space 45 is formed between the first limiting portions 461 and the second limiting portions 462, and the side surfaces of the battery cell 3 are respectively fitted with the first limiting portions 461 and the second limiting portions 462.

[0113] Wherein, the first limiting part 461 and the second limiting part 462 can both be recessed structures. Exemplarily, the first limiting part 461 and the second limiting part 462 arranged opposite to each other on two adjacent liquid-cooling channels 46 can be recessed in a direction away from each other, so that a larger installation space 45 can be formed between the first limiting part 461 and the second limiting part 462, and at least part of the battery cell 3 can extend into the installation space 45, and the outer side surface of the battery cell 3 can fit with the first limiting part 461 and the second limiting part 462, so that the first limiting part 461 and the second limiting part 462 can limit the circumferential direction of the battery cell 3.

[0114] The material of the liquid cooling channel 46 can be made of aluminum plate, which has good thermal conductivity, so that the coolant can absorb the heat generated by the battery cell 3. When the battery cell 3 is inserted into the installation space 45 formed between two adjacent liquid cooling channels 46, the aluminum liquid cooling channel 46 can also be slightly deformed, so that the battery cell 3 can be inserted into the installation space 45. After the battery cell 3 is inserted, the liquid cooling channel 46 can contact the side wall of the battery cell 3 and clamp the battery cell 3 to limit the position of the battery cell 3.

[0115] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power battery, characterized in that: include: Battery cells (3); A liquid cooling device (4), the liquid cooling device (4) comprising a first liquid cooling chamber (41), a second liquid cooling chamber (42) and a plurality of liquid cooling channels (46) arranged opposite to each other, one end of the liquid cooling channel (46) being connected to the first liquid cooling chamber (41), the other end of the liquid cooling channel (46) being connected to the second liquid cooling chamber (42), an installation space (45) for installing the battery cell (3) being formed between two adjacent liquid cooling channels (46), and the liquid cooling channel (46) being arranged on a side of the battery cell (3); The heating device (2) is arranged at the bottom of the battery core (3).

2. The power battery according to claim 1, characterized in that: The heating device (2) comprises a middle area (2a) and an edge area (2b), and the heating device (2) comprises a plurality of resistors (222), wherein the plurality of resistors (222) are distributed in the middle area (2a) and the edge area (2b), and the heating power of the resistors (222) located in the middle area (2a) is lower than the heating power of the resistors (222) located in the edge area (2b).

3. The power battery according to claim 2, characterized in that: The heating device (2) further comprises a heating plate (21) and a heating component (22), wherein the heating component (22) is mounted on the heating plate (21); The heating components (22) each comprise a heating film (221) and a plurality of resistors (222), wherein the plurality of resistors (222) are encapsulated in the heating film (221).

4. The power battery according to claim 3, characterized in that: The heating plate (21) is provided with a positioning groove (211), and the heating component (22) is installed in the positioning groove (211); the thickness of the heating component (22) is less than or equal to the depth of the positioning groove (211).

5. The power battery according to claim 4, characterized in that: The positioning groove (211) is a strip-shaped groove; the positioning groove (211) comprises a first groove (211a) and a second groove (211b), the first groove (211a) is located in the middle area (2a), and the second groove (211b) is located in the edge area (2b); and / or, The positioning groove (211) comprises a third groove (211c), at least part of the third groove (211c) is located in the middle area (2a), and at least another part of the third groove (211c) is located in the edge area (2b).

6. The power battery according to claim 5, characterized in that: A plurality of the first grooves (211a) are provided, and at least some of the first grooves (211a) have different lengths; along a direction perpendicular to the extension direction of the first groove (211a), the positions of the heating components (22) in at least two of the first grooves (211a) are aligned; and / or, A plurality of the second grooves (211b) are provided, and at least some of the second grooves (211b) have different lengths; along a direction perpendicular to the extension direction of the second grooves (211b), the positions of the heating components (22) in at least two of the second grooves (211b) are aligned.

7. The power battery according to any one of claims 2 to 6, characterized in that: Along the height direction of the power battery, the ratio of the projection area of ​​the middle region (2a) to the projection area of ​​the heating device (2) is between 1 / 2 and 2 / 3.

8. The power battery according to any one of claims 2 to 6, characterized in that: The liquid cooling device (4) comprises a first heat insulating member (43) and a second heat insulating member (44) which are arranged opposite to each other, and the first heat insulating member (43), the second heat insulating member (44), the first liquid cooling chamber (41) and the second liquid cooling chamber (42) are arranged to form a frame structure.

9. The power battery according to claim 8, characterized in that: The liquid cooling device (4) further comprises a first positioning plate (5) and a second positioning plate (6), wherein the first positioning plate (5) and the second positioning plate (6) are respectively arranged on both sides of the frame structure along the height direction (Z), one end of the battery cell (3) abuts against the first positioning plate (5), and the other end of the battery cell (3) abuts against the second positioning plate (6); The heating device (2) is arranged on a side of the second positioning plate (6) facing away from the battery core (3).

10. The power battery according to claim 9, characterized in that: The first positioning plate (5) is provided with a first limiting groove (51), the second positioning plate (6) is provided with a second limiting groove (61), one end of the battery cell (3) is clamped in the first limiting groove (51), and the other end of the battery cell (3) is clamped in the second limiting groove (61).

11. The power battery according to claim 9, characterized in that: It also includes an upper cover (11) and a bottom plate (12), wherein the upper cover (11) is buckled onto the bottom plate (12), and an accommodation space for accommodating the liquid cooling device (4), the battery cell (3) and the heating device (2) is formed between the upper cover (11) and the bottom plate (12).

12. The power battery according to claim 11, characterized in that: It also includes an insulating plate, which is arranged between the upper cover (11) and the first positioning plate (5).

13. The power battery according to any one of claims 1 to 6, characterized in that: The liquid-cooling channel (46) is provided with a plurality of first limiting portions (461), and another adjacent liquid-cooling channel (46) is provided with a plurality of second limiting portions (462), the first limiting portions (461) and the second limiting portions (462) are positioned relative to each other, and the installation space (45) is formed between the first limiting portions (461) and the second limiting portions (462), and the side surfaces of the battery cell (3) are respectively in contact with the first limiting portions (461) and the second limiting portions (462).

14. A vehicle, characterized in that: A power battery comprising any one of claims 1 to 13.

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